Secrets of the London Underground

Tim Dunn and Siddy Holloway explore the abandoned underground branch line between Holborn and Aldwych. At Holloway Road they find out about the Tube network's only spiral escalator.

Tim Dunn and Siddy Holloway travel under Hampstead Heath to visit the incomplete North End station. Though abandoned before completion, this station was reborn during the Cold War as a nuclear bunker.

Tim Dunn and Siddy Holloway explore the disused parts of Piccadilly Circus, perhaps the grandest station on the London Underground, and visit the long-abandoned Highgate surface station.

Tim Dunn and Siddy Holloway explore the hidden parts of Euston, including unique features not found elsewhere, They also examine the bits which are set for demolition to make way for HS2.

A night-time adventure as the hosts go on a late-night exploration of two of London's least known stations. St Mary's and the original Aldgate East, they're only a few hundred metres apart but trains haven't stopped at either since 1938.

Tim Dunn and Siddy Holloway explore Clapham South deep level shelter where thousands of Londoners slept in the war.